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sparc64: Add 16GB hugepage support

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Adds support for 16GB hugepage size. To use this page size
use kernel parameters as:

default_hugepagesz=16G hugepagesz=16G hugepages=10

Testing:

Tested with the stream benchmark which allocates 48G of
arrays backed by 16G hugepages and does RW operation on
them in parallel.

Orabug: 25362942

Cc: Anthony Yznaga <anthony.yznaga@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nitin Gupta
2017-08-11 16:46:50 -07:00
committed by David S. Miller
parent 44382b0195
commit df7b2155bb
9 changed files with 158 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

76
arch/sparc/mm/hugetlbpage.c
View File

@@ -143,6 +143,10 @@ static pte_t sun4v_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
pte_val(entry) = pte_val(entry) & ~_PAGE_SZALL_4V;
switch (shift) {
case HPAGE_16GB_SHIFT:
hugepage_size = _PAGE_SZ16GB_4V;
pte_val(entry) |= _PAGE_PUD_HUGE;
break;
case HPAGE_2GB_SHIFT:
hugepage_size = _PAGE_SZ2GB_4V;
pte_val(entry) |= _PAGE_PMD_HUGE;
@@ -187,6 +191,9 @@ static unsigned int sun4v_huge_tte_to_shift(pte_t entry)
unsigned int shift;
switch (tte_szbits) {
case _PAGE_SZ16GB_4V:
shift = HPAGE_16GB_SHIFT;
break;
case _PAGE_SZ2GB_4V:
shift = HPAGE_2GB_SHIFT;
break;
@@ -263,7 +270,12 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
if (pud) {
if (!pud)
return NULL;
if (sz >= PUD_SIZE)
pte = (pte_t *)pud;
else {
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return NULL;
@@ -289,12 +301,16 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
if (!pgd_none(*pgd)) {
pud = pud_offset(pgd, addr);
if (!pud_none(*pud)) {
pmd = pmd_offset(pud, addr);
if (!pmd_none(*pmd)) {
if (is_hugetlb_pmd(*pmd))
pte = (pte_t *)pmd;
else
pte = pte_offset_map(pmd, addr);
if (is_hugetlb_pud(*pud))
pte = (pte_t *)pud;
else {
pmd = pmd_offset(pud, addr);
if (!pmd_none(*pmd)) {
if (is_hugetlb_pmd(*pmd))
pte = (pte_t *)pmd;
else
pte = pte_offset_map(pmd, addr);
}
}
}
}
@@ -305,12 +321,20 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t entry)
{
unsigned int i, nptes, orig_shift, shift;
unsigned long size;
unsigned int nptes, orig_shift, shift;
unsigned long i, size;
pte_t orig;
size = huge_tte_to_size(entry);
shift = size >= HPAGE_SIZE ? PMD_SHIFT : PAGE_SHIFT;
shift = PAGE_SHIFT;
if (size >= PUD_SIZE)
shift = PUD_SHIFT;
else if (size >= PMD_SIZE)
shift = PMD_SHIFT;
else
shift = PAGE_SHIFT;
nptes = size >> shift;
if (!pte_present(*ptep) && pte_present(entry))
@@ -333,19 +357,23 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
unsigned int i, nptes, hugepage_shift;
unsigned int i, nptes, orig_shift, shift;
unsigned long size;
pte_t entry;
entry = *ptep;
size = huge_tte_to_size(entry);
if (size >= HPAGE_SIZE)
nptes = size >> PMD_SHIFT;
else
nptes = size >> PAGE_SHIFT;
hugepage_shift = pte_none(entry) ? PAGE_SHIFT :
huge_tte_to_shift(entry);
shift = PAGE_SHIFT;
if (size >= PUD_SIZE)
shift = PUD_SHIFT;
else if (size >= PMD_SIZE)
shift = PMD_SHIFT;
else
shift = PAGE_SHIFT;
nptes = size >> shift;
orig_shift = pte_none(entry) ? PAGE_SHIFT : huge_tte_to_shift(entry);
if (pte_present(entry))
mm->context.hugetlb_pte_count -= nptes;
@@ -354,11 +382,11 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
for (i = 0; i < nptes; i++)
ptep[i] = __pte(0UL);
maybe_tlb_batch_add(mm, addr, ptep, entry, 0, hugepage_shift);
maybe_tlb_batch_add(mm, addr, ptep, entry, 0, orig_shift);
/* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
if (size == HPAGE_SIZE)
maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0,
hugepage_shift);
orig_shift);
return entry;
}
@@ -371,7 +399,8 @@ int pmd_huge(pmd_t pmd)
int pud_huge(pud_t pud)
{
return 0;
return !pud_none(pud) &&
(pud_val(pud) & (_PAGE_VALID|_PAGE_PUD_HUGE)) != _PAGE_VALID;
}
static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
@@ -435,8 +464,11 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
ceiling);
if (is_hugetlb_pud(*pud))
pud_clear(pud);
else
hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
ceiling);
} while (pud++, addr = next, addr != end);
start &= PGDIR_MASK;